Stereoselectivities of the intramolecular Diels-Alder reaction in the azanona- and azadecatriene series. Preparation of some polyhydroisoindoles, polyhydroisoquinolines, decahydropyrido[2,1-a]isoindoles and decahydro-2H-pyrido[1,2-b]isoquinolines
作者:Anders Tsirk、Salo Gronowitz、Anna-Britta Hörnfeldt
DOI:10.1016/s0040-4020(98)00514-6
日期:1998.8
polyhydroisoquinolines were prepared through ring-opening of 3-bromo-2,5-dimethylthiophene-1,1-dioxide (1) with amines 2 and 3 giving trienes 5 and 6, which could be cyclized in an intramolecular Diels-Alder reaction (IMDA). Decahydropyrido[2,1-a]isoindoles and decahydro-2H-pyrido[1,2-b]isoquinolines were prepared stereoselectively (92–99%) in four steps in 60–63% overall yields via a TiCl4 catalyzed IMDA
取代的多氢异吲哚和多氢异喹啉是通过将3-溴-2,5-二甲基噻吩-1,1-二氧化物(1)与胺2和3开环而制得的三烯5和6,可以在分子内Diels-Alder中环化。反应(IMDA)。十氢吡啶并[2,1- a ]异吲哚和十氢2 H-吡啶[1,2- b ]异喹啉通过TiCl 4催化的IMDA分四步以60-63%的总收率立体制备(92-99%)。使用半经验和从头算对IMDA中的立体选择性进行讨论 计算也被提出。